One thing I notice among many new people who want to run a business online is thinking they have to come up with some great idea that no one has thought of to be a success and make money. This is totally wrong! For instance imageshack came out a while back and was becoming a huge success. So I bought a domain and begain to advertise it even though there was sites just like it already out there, and you know what?  It was a success I had tons of visitors daily to it and their was still more space for others to come along and make their own site.  After a few months I sold the site for thousands of dollars and all I had to pay for was the domain name and the script! So go start your dream site now.